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Toxic shock syndrome toxin-1 (TSST-1) up-regulates B7.2+B7.1− but not B7.2−B7.1+ B cells. Peripheral blood mononuclear cells (PBMC) from six normal donors were analysed by flow cytometry for the expression of B7.2 and B7.1 on the same B cells after culture for 48 h with a range of TSST-1 concentrations. Results from each individual and geometric mean values are shown.
